Pinvoke - .NET - Calling Kernel32.DLL's Wow64DisableWow64FsRedirection?
Oct 13, 2010
Looking at Microsoft's page on Wow64DisableWow64FsRedirection, I see some C code. What if you want to call this function and it's revert from VB.net? So far I have done this:
<Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint:="Wow64DisableWow64FsRedirection")> _
Public Shared Function DisableWow64Redirection() As Boolean
End Function
And I do likewise for the Revert brother function.This seems to work, as the shell command I call after actually finds its exe in system32, but I am not sure about the Revert, does it need a parameter? This Revert page seems to want me to take the output from disable and plug it into the revert call. Does that sound right? How do I change my DLLimport to take in a boolean and actually use it in the Kernal32.DLL function?
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Aug 30, 2010
I've got a dll, written in C++ (which I have the source code for and have compiled it under VS2010)It has a function I want to call in VB
SHARED_FUNCTION int yasdiMasterInitialize(const char * iniFile,DWORD * pDriverNum );
I've declared it as follows:
<DllImport("yasdimaster.dll")> Public Function yasdiMasterInitialize(ByRef IniFile As String, ByRef DriverNum As UInt32) As Integer
End Function
as when I try and use it as follows I get a pInvoke error:
Console.WriteLine("Initialise:" & yasdiMasterInitialize("yasd.ini", Drivers))
From reading around this is something to do with the declaration but I don't know what to change as this is the first time I've tried calling a DLL.
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Nov 7, 2010
coming from VB6 I've been using the windows API for many years. Now I'd lke to do the same on .NetMy question is, what would happen if I build for 'AnyCPU' and the application calls Kernel32 while running on a 64bit machine ?
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Jul 23, 2009
I want to migrate vb.net project onto linux platform using mono, but I am getting one problem system.dllnotfound exception: kernel32.I like to ask ,when does visual basic add this kernel32 dll. can I remove this kernel32 dll from my project?
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Nov 10, 2010
I have a multi-threaded report engine application. I know that if I want to pause a thread for an interval I can use Thread.Sleep. What I need however, is to be able to suspend the entire process including all threads for a set period of time. In the past, I've used the Sleep API from kernel32.
It appears though that it's only "sleeping" my current thread and not the entire process which is not what I expected (now that I've read the documentation I realize that Thread.Sleep is probably the managed implementation of this API which is why it behaves as it does). So, my question, how do I force the entire application (and all of its threads) to pause the for the interval and not just the thread calling it? Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Int32)
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Oct 22, 2009
I get this during debug Unable to find an entry point named 'CloseHandleA' in DLL 'kernel32'.I get no compiling errors, I just get this Debug error :/
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Dec 16, 2010
I've an issue regarding p/invoke from managed to unmanaged code. See my original post at the MSDN forum (as brief summary is seen later in this post). Before I go on, I just want to explain a couple of things: I have a wrapper assembly in net 3.5 that does the actual interop to the unmanaged code. Then I have my console "host app" which uses the wrapper assembly. The solution I came up (I refer to my MSDN post) works when the host app is using .net 4, but it doesn't work when changing the host app to use .net 3.5. When changing, I get a AccessViolationException.
host app: 4.0, wrapper assembly: 3.5
-> works
host app: 3.5, wrapper assembly: 3.5 -> throws
AccessViolationException
Do anyone have a clue to why I get an AccessViolationException? Most importantly, how do I get it working with .net 3.5?
Brief summary on the MSDN post I refered to. I have this messy p/Invoke I need to solve. The C declaration looks like this:
long TBAPI TbeAndring (short,
short,
PTB_PU,
PTB_ANDRING_INFO,
PTB_PARAMS,
[CODE]...
Where PTB means that each argument is a struct pointer to an array of arbitrary length. The structs mostly contains strings, doubles, char and short. Anyway, I ended up with this DllImport statement:
<DllImport(NativeLibraryName, CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Ansi, SetLastError:=True)>
Public Shared Function TbeAndring(ByVal sAntMoment As Short, _
ByVal sAntPU As Short, _
[CODE]...
As you see some of the arguments are changed by the unmanaged code as well.
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May 3, 2011
I'm really struggling with the following pinvoke call. I've tried numerous different ways of doing this but still no joy. The call runs through, but I get a 'Bad parameter' message back with suggests there is something wrong with the struct, since I've ran through a c++ example of this code and the parameters are all correct.
[Code]...
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Aug 26, 2011
I have just upgraded(!) to VS2010, and opened my project from VS2008, which worked, and when i try to run i get a Pinvoke error due to stack imbalance. I am completely lost, on this error. What do i need to do to solve it. The error occurs at the If GetAsyncKeyState(8) Then part of the code below. It is detecting for a backspace being pressed. Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
[Code]...
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Aug 13, 2011
I want to delete, copy, move, and rename files using the actual Windows confirmation dialogs.I am using SHFileOperation. My problem is, that, when I want to move a folder with this path:
"C:MyFolderToMove"
And I set the destination to:
"C:UsersTest"
And (THIS PART IS IMPORTANT) the APPLICATION start from say
"D:MyApp.exe"
[code]....
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Jan 19, 2009
I am running Visual Studio 2005 (I tried 2008 and got the same error) using SQLite for a device project. (Windows 6 Mobile)The identical code works perfectly for Windows, but when I execute
f.FileName = PathForDB
SQLconnect.ConnectionString = "Data Source=" & f.FileName & ";"
SQLconnect.Open()
I get the above message. I have tried to "manually" load the DLL at the beginning of my code, but I still get the same message.
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Jun 7, 2011
I want to enable the 'ReaderMode' for paning/scrolling my control in .Net. Closest thing I found was this Win API function .url....However, I'm not sure how to call this one, in the documentation it says, This function is not declared in any public header. To use it, you must access it as ordinal 383 from Comctl32.dll.I've never called a function that didn't have a name before, can anyone describe how to do this in VB.Net?
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Sep 9, 2009
I'm using PInvoke to access some routines from a third party library, however i'm getting SEHExceptions when trying to use callbacks defined for one particular method. The callbacks are used to provide feedback from other unmanaged methods within the third party library, passing a string back to the calling application containing a status message.
[Code]...
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Mar 29, 2012
I have a problem listing directory information in a process I wrote to call directory listing of the $MFT routine.The gang has convinced me that the problem is that I'm not calling the routine in Kernel Mode.How does one call a routine in Kernel Mode besides using pinvoke which is slow...."MODERN PROGRAMMING is deficient in elementary ways BECAUSE of problems INTRODUCED by MODERN PROGRAMMING." Me?
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Dec 15, 2010
i have an error when im using a function in dll. i declare this( "Private Declare Function SetChannel Lib "StreamReader.dll" (ByVal freq As Long, ByVal smyb As Long, ByVal pol As Long, ByVal fec As Long, ByVal lof1 As Long, ByVal lof2 As Long, ByVal lofsw As Long) As Boolean") [Code]
this is that error"A call to PInvoke function 'skynet!WindowsApplication1.Form1::SetChannel' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.".
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Nov 6, 2010
I have created a webcam application in vb2010, when I run the app I get a run time error, please see below PInvokeStackImbalance was detected Message: A call to PInvoke function 'WebCam!WindowsApplication1.WebCamMainForm::SendMessage' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
it is coming up on this block of code'This sub will open the preview window
Private Sub OpenPrewiewWindow()
Dim iHeight As Integer = WebCamPictureBox.Height
Dim iWidth As Integer = WebCamPictureBox.Width
[code]....
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Aug 24, 2010
I'm getting the following error:A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::GetCursorPos' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
[Code]...
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Sep 7, 2009
i got error stated :"This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature."when i tried to run function from a dll file. I searched many forum but can't get a suitable solution. urgent help needed.
here is my
Public Declare Function CXCMD_LoadCard Lib "PCP02CT.DLL" (ByVal iSlot As Integer, ByVal iID As Integer, ByVal iDest As Long, ByVal bflip As Long, ByVal blmmed As Long) As Integer
[code]...
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Jun 24, 2011
Public Structure WSADATA
Dim wversion As Integer
Dim wHighVersion As Integer
[Code].....
Code above give me this error
"PInvoke restriction: cannot return variants"
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Apr 15, 2009
im using vb.net windows mobile 5.0 and im trying to make a application and when i try to connect it to the SQL server 2000 i encounter this error Can't Find PInvoke DLL "dbnetlib.dll"
sample code:
import system.data
import system.data.sqlclient
[code].....
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Jul 11, 2010
I was trying to use a GetAsyncKeyState code but each time I run the program an error occers where
[Code]....
'A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::GetAsyncKeyState' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.' The full code is in timer with (1) time interval
[Code]...
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Aug 3, 2010
I have a C++ application exe that uses a C++ dll. I don't have the source of this C++ application and cannot rebuild it. But I know that it uses the traditional LoadLibrary and GetProcAddress to access individual functions in the dll.For some reasons, I want to replace the C++ dll with a VB.NET dll. The dll is not and ActiveX and is therefore not registered.I think I cannot use a class but a module since the C++ exe application does not expect any class in the dll. In all my attempts, I could not have the inner functions of the VB.NET to be called by the C++ exe.How should I write the VB.NET dll?
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Sep 16, 2011
I do realize that a number of questions regarding calling a DLL from vb.net have been raised. I have implemented the DLL from vb.net. I would like to know if the calling procedure is correct or should I be calling the DLL in a different way?
C++ DLL prototype
extern "C" int FitCurve(int solid_or_fluid, int prop_id, int fit_id, int N_points, int N_terms, char *file, double *x_data, double *y_data)
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Sep 1, 2010
I'm not sure whether this is a VB forum question or a C++ question, but I'll try here first. I have an API library written in C++ (including source) which compiles to several DLLs. I want to call the functions in the library from VB but I can't get the parameter passing right.
[Code]...
The above example runs but returns nothing. If I change DeviceName to ByRef, I get protected memory errors.
The full library and documentation is available on the internet if anyone would like to download it and I've successfully compiled it with VS2010.
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Dec 28, 2010
I have a dll which has one function and I want to call this function from Visual Basic 2008. I tried every solution, but I couln't get it to work,
The original declaration is the following in C++
extern "C" CSSM_API void GetOptimalCSSMShaderParams(
float* outProjMatrixArray
,float* outCtrlMatrixArray
[Code].....
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Jun 9, 2010
I want to connect to SAP and call RFC from VB.Net 2008.I have done it with VB 6.0 But not getting success in VB.Net I used following code in VB 6.0
Set ctlLogon = CreateObject("SAP.LogonControl.1")
Set oConnection = ctlLogon.NewConnection
oConnection.User = "SIILRFC"
[code].....
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Jun 21, 2012
I have followed instructions on Best way to use a VB.NET class library from a C++ DLL? but being new to VB I don't know if I've got the VB part right let alone the C++. here I'll correct the code below for posterity's sake!
Here they are: VB first; the project is a Class Library, all settings default except that "Register for COM interop" is switched on in the project properties.
Public Class Class1
Public Sub New()
'do stuff
[Code]....
is the VB correct? Do I need to add anything like an interface to it? Assuming I want to call it over COM not C++/CLI, how do I do that. (This seems like the logical choice as the client already calls other stuff over COM; however, I'm not sure where to get the IDispatch pointer from, in my other code it's passed to me by the client). If I went the C++/CLI route, when moving up from toy project to actual implementation, that would mean changing my existing C++ code from "no clr support" to "/clr" - is that likely to break it?
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Aug 3, 2010
I have a C++ application exe that uses a C++ dll. For some rasons, I want to replace the C++ dll with a VB.NET dll. The dll is not and ActiveX and is therefore not registered.I cannot use a class but a module since the C++ application does not expect any class in the dll. In all my attempts, I could not have the inner functions of the VB.NET to be called by the C++ exe.How should I write the VB.NET dll?
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Mar 15, 2012
This might seem like an insanely easy question, but I cant seem to find an answer anywhere to it. I'd like to think that I am decent at VB but while I was learning javascript the other day I found something that seemed awesome and now I cant figure out how to do it in VB.in javascript it looks like this
var someValue = getThatValue()Its both calling and setting the value from the getThatValue() sub. what is the VB equivalent?
[Code]...
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Jun 10, 2010
In C# I can do this:new SomeObjectType("abc", 10);
In other words, I can call new without assigning the created instance to any variable. However, in VB.Net it seems I cannot do the same thing.New SomeObjectType("abc", 10) ' syntax error
Is there a way to do this in VB.Net?
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